Oxygen-enriched combustion tail gas treatment system adopting low-temperature condensation method

Abstract

The invention discloses an oxygen-enriched combustion tail gas treatment system adopting a low-temperature condensation method, and belongs to the technical field of industrial waste gas treatment. The tail gas treatment system comprises a carbon dioxide capturing device communicating with a tail gas end of an oxygen-enriched combustion device; the oxygen-enriched combustion device comprises a combustion furnace, an oxygen supplier for providing oxygen for combustion in the combustion furnace, and a tail gas treater communicating with an exhaust end of the combustion furnace and used for purifying and outputting carbon dioxide gas; the carbon dioxide capturing device comprises a condensation cavity, a cold source for providing a cold capacity to the condensation cavity, a liquefying cavityseparated from the condensation cavity through an openable sealing plate, and a liquid storage tank for collecting liquid in the liquefying cavity; a heat exchange coil is arranged at the bottom of the liquefying cavity; a gas outlet communicating with the condensation cavity is formed in the side wall of the liquefying cavity; and after carbon dioxide output from the tail gas treater is introduced in the heat exchange coil, the heat exchange coil communicates with the condensation cavity. The tail gas treatment system can realize pressurization without using additional energy, and improves the energy utilization rate.

Description

technical field [0001] The invention relates to the technical field of industrial waste gas treatment, in particular to an oxygen-enriched combustion tail gas treatment system using a low-temperature desublimation method. Background technique [0002] At present, most of the power generation systems in my country's power industry use air-assisted combustion. my country consumes a large amount of coal and emits a large amount of carbon dioxide every year, posing a threat to the global climate. Oxygen-enriched combustion technology is one of the most potential large-scale carbon emission reduction technologies for coal-fired power plants. It uses high-purity oxygen instead of combustion-supporting air on the basis of existing power plant boiler systems, and can obtain up to 80% volume concentration Carbon dioxide flue gas and tail gas containing high concentration of carbon dioxide can be utilized as resources through a series of related measures. [0003] The traditional tre...

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Problems solved by technology

[0005] The disadvantage of this invention is that the state when carbon dioxide is produced is high pressure, which requires the oxygen and natural gas in the combustion furnace to be high pressure, and there are certain requirements for the pressure of raw gas; in addition, carbon dioxide is in the process of phase change. Heat exchange with other fluids is achieved in a non-contact manner, and sufficient heat exchange cannot be achieved

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